Length of horizontal Waste line
I am adding a bathroom on the second floor of my home. The question I have is: is there a maximum distance that my horizontal waste line can be from my main waste line, I have proper venting on the second floor through the roof. The problem is the bathroom is on the opposite side of the house from the existing 4" main. I have a strait shot vertically to the basement from the bathroom. The branch wasteline will have to run across about 20 feet of basement to reach the main waste line out to the septic tank. Am I ok as long as the 3" branch is sloped to the 4" main (1/4" per foot)?